Decks and Porches

A deck/porch requires a building permit if it is:

  • of any size and attached to a building, or
  • of any size and forms part of a building's exit/egress, or
  • greater than 10m2 (107 ft2) and any part of the perimeter is 2ft above grade, or
  • greater than 10m2 (107 ft2) and any part of the perimeter of deck is adjacent to ground that slopes away at more than 2:1 slope.

Even where a building permit is not required by the Town, the structure must still comply with the Zoning By-law and be constructed in accordance with Ontario's Building Code.

Many plastic components for decks and guards are not approved for use by Ontario's Building Code. You will require a Minister's Ruling or Building Materials Evaluation Committee approval if you wish to use plastic materials.


Make sure you can build the deck or porch you want by consulting:

  • Town of Georgina, Zoning By-law

  • Town of Georgina, Septic System Approvals: If your property is serviced by a septic system, your deck or porch must be located away from your septic. Please email the Building Division regarding the location of your septic system.
  • Town of Georgina, Site Alteration Permit: Contact the Development Engineering Division by email for information regarding a Site Alteration Permit if you are building your deck or porch on a conventional foundation. This ensures that the grading and drainage of your property will not negatively affect a neighbouring property. This approval will be needed before building permit issuance. Note: Decks and porches constructed on pier foundations (such as “sonotubes”) will not require a Site Alteration Permit.

  • Lake Simcoe Region Conservation Authority: Approval from the LSRCA is needed if you are constructing in their regulated area. LSRCA regulations may restrict construction. Consult LSRCA's mapping tool to see if your property is regulated.

  • Other approvals (where regulated)


Design is the next step. You will need a set of construction drawings to submit to the Building Division for review before a permit can be issued and construction can begin. 

Design Drawings

  • Must be prepared by a competent designer
  • Must be drawn to scale and accurately and neatly drawn
  • May be made by the owner if the owner takes responsibility for the design (Note: all designers must demonstrate a level of design competency)
  • May require a designer with specific credentials (e.g. P.Eng.) for complicated or specialized designs

Drawing Package Information 

  • A Site Plan, showing lot dimensions, north arrow, the road, any watercourses, all buildings, building sizes, dimensions of the proposed deck or porch with stairs marked, plus setbacks to property lines. Note: A survey is a great starting point for a site plan as it will already have most of this information
  • Birds-eye view overhead drawing, dimensioned, showing locations of posts and piers with spans clearly marked; size, direction and spacing of beams and joists, and stair location
  • An elevation drawing, showing the height of the deck surface above grade, railing/guard information including height and picket spacing, attachment to the house information including the existing house foundation, ie. strip footing/slab on grade/basement
  • Roof plans, for porch construction, showing size and spacing of rafters, attachment to the house, beam size, post size and spacing, etc.
  • Additional information where necessary to accurately show proposed work
  • Do ensure that your pre-manufactured guard/handrail system complies with all structural requirements of the building code. Note that most plastic components are NOT allowed.
  • Do ensure that any ledger boards that are attached to the house are positively connected to the framing. The inspector will need to verify this visually
  • Do ensure all wood exposed to the weather is pressure treat for that use
  • Do not use plastic components without confirming that they are allowed.
  • Do not bury wood columns in concrete piers or in the ground. Wood columns should be pressure treated and attached to a concrete pier foundation with an approved saddle.
  • Do not construct your deck on “deck blocks”. There are some exceptions; contact the Building Division by email for more information

Building Permit Application Requirements 

Contact the Building Division by email to request more information or to clarify anything regarding construction of a building.

Additional Resources

Contact Us

26557 Civic Centre Rd, RR 2
Keswick, ON  L4P 3G1

T: 905-476-4301 / 705-437-2210
F: 905-476-8100

Hours of Operation

Monday to Friday
8:30 a.m. to 4:30 p.m.